Chromate conversion coating of aluminum

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Aluminum chromate conversion coating (also known as: chromate passivation, chemical conversion coating, chromate treatment) is a chemical process used to protect aluminum and its alloys from corrosion and to improve the adhesion of paints and coatings. It is one of the oldest and most widely used methods of surface protection for light metals, especially in the aerospace, automotive, and electronics industries.
 
Main features of aluminum chromate conversion coating:
  1. Corrosion protection:
    • The passive layer protects aluminum from oxidation and the effects of aggressive environmental factors.
  2. Improved coating adhesion:
    • Used as an intermediate layer before painting or bonding.
  3. Electrical conductivity:
    • A thin chromate layer still conducts electricity, which is important, for example, in electronics.
  4. Self-healing of micro-damages:
    • When chromium is used, the layer exhibits the ability to "self-regenerate" in case of micro-damages - thanks to the migration of chromium ions.
 
Maximum dimensions of elements subjected to chromate conversion coating: 2200 mm x 500 mm x 700 mm 

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